In-vehicle system and signal processing method

Abstract

An in-vehicle system includes a basic system provided in a vehicle, and an additional system to be added to the vehicle. When the basic system and the additional system execute processing in cooperation, in a first mode in which transmission and reception of a video signal and an audio signal are not performed between the basic system and the additional system, transmission of a control signal for controlling the additional system is limited to unidirectional transmission from the basic system to the additional system. In this case, in a second mode in which one or more lines of video audio signals each including at least one of a video signal or an audio signal are transmitted and received between the basic system and the additional system, transmission of the one or more lines of video audio signals is limited to unidirectional transmission from the basic system to the additional system.

1 . An in-vehicle system comprising:
 a first system provided in a vehicle; and   a second system to be added to the vehicle,   wherein when the first system and the second system execute processing in cooperation,   (i) in a first mode in which transmission and reception of a video signal and an audio signal are not performed between the first system and the second system, transmission of a signal is limited to unidirectional transmission from the first system to the second system, and   (ii) in a second mode in which one or more lines of video audio signals each including at least one of a video signal or an audio signal are transmitted and received between the first system and the second system, transmission of the one or more lines of video audio signals is limited to unidirectional transmission from the first system to the second system.   
     
     
         2 . The in-vehicle system according to  claim 1 ,
 wherein the second system includes a first electronic device and a second electronic device,   the first system:
 transmits a switching signal corresponding to the first mode to the second system in the first mode, and 
 transmits a switching signal corresponding to the second mode to the second system in the second mode, 
   when the second electronic device in the second system receives the switching signal corresponding to the first mode, the second electronic device in the second system obtains a video audio signal including at least one of a video signal or an audio signal from the first electronic device, and outputs the video audio signal obtained to an output device including at least one of a display or a loudspeaker, the output device being provided in the vehicle, and   when the second electronic device in the second system receives a switching signal corresponding to the second mode, the second electronic device in the second system receives the video audio signal from the first system as one of the one or more lines of video audio signals, and outputs the video audio signal received to the output device.   
     
     
         3 . The in-vehicle system according to  claim 2 ,
 wherein in the first mode, the first system accepts an operation signal in response to an input operation by a user, and transmits the operation signal to the second system, and   the first electronic device in the second system receives the operation signal from the first system, generates the video audio signal by executing processing in response to the operation signal, and outputs the video audio signal generated to the second electronic device.   
     
     
         4 . The in-vehicle system according to  claim 2 ,
 wherein in the second mode, the first system accepts an audio signal of a user speech sound, and transmits the audio signal to the second system as one of the one or more lines of video audio signals, and when the first system receives a processed result signal transmitted from the second system, the first system generates a video audio signal according to the processed result signal, and transmits the video audio signal generated to the second system as one of the one or more lines of video audio signals, and   the first electronic device in the second system receives the audio signal from the first system, executes audio recognition processing on the audio signal, and transmits the processed result signal obtained by the audio recognition processing to the first system.   
     
     
         5 . The in-vehicle system according to  claim 1 ,
 wherein the second system executes processing in cooperation with the first system by holding and executing a software program identical to a software program included in the first system.   
     
     
         6 . The in-vehicle system according to  claim 1 ,
 wherein the first system and the second system wirelessly transmit and receive signals other than a video signal.   
     
     
         7 . An in-vehicle system to be added to a vehicle provided with a basic system, the in-vehicle system comprising:
 a memory; and   a processor that executes processing in cooperation with the basic system using the memory,   wherein (i) in a first mode in which transmission and reception of a video signal and an audio signal are not performed between the basic system and the in-vehicle system, the processor does not transmit any signal to the basic system, receives a signal transmitted from the basic system to the in-vehicle system, and executes the processing, and   (ii) in a second mode in which one or more lines of video audio signals each including at least one of a video signal or an audio signal are transmitted and received between the basic system and the in-vehicle system, the processor does not transmit the one or more lines of video audio signals to the basic system, receives the one or more lines of video audio signals transmitted from the basic system to the in-vehicle system, and executes the processing.   
     
     
         8 . A signal processing method to be performed by an in-vehicle system,
 the in-vehicle system including a first system provided in a vehicle, and a second system to be added to the vehicle,   the signal processing method comprising:   when the first system and the second system execute processing in cooperation,   (i) in a first mode in which transmission and reception of a video signal and an audio signal are not performed between the first system and the second system, transmitting a signal only unidirectionally from the first system to the second system; and   (ii) in a second mode in which one or more lines of video audio signals each including at least one of a video signal or an audio signal are transmitted and received between the first system and the second system, transmitting the one or more lines of video audio signals only unidirectionally from the first system to the second system.